In 2008 a group of Norwegian researchers ran an experiment to better understand how police investigators come to a judgment about the credibility of rape claims. Sixty-nine investigators were played video-recorded versions of a rape victim’s statement, with the role of victim played by an actress. The wording of the statement in each version was exactly the same, but the actress delivered it with varying degrees of emotion. The investigators, who prided themselves on their objectivity, turned out to be heavily influenced in their judgments by assumptions about the victim’s demeanour: she was judged most credible when crying or showing despair.

In reality, rape victims react in the immediate aftermath of the event in a variety of ways: some are visibly upset; others are subdued and undemonstrative. There is, unsurprisingly, no universal reaction to being raped. The detectives were relying on their instincts, and their instincts turned out to be constructed from inherited and unreliable notions about women in distress.